Gun structure for cathode-ray tubes



r 2 Sheets-Sheet l s. J. KOCH ETAL GUN STRUCTURE FOR CATHODE RAY TUBES Filed Oct. s, 1945 Get. 28, 1947.

' Oct. 28,1947. s. J. KOCH IETALQ I I ,3

GUN STRUCTURE FOR CATHODE RAY TUBES Filed Oct. 8, 1943 2 Sheets-Shet 2 .INV'ENTOR5 I and therefore said guns have the same Patented Oct. 28 1947 GUN STRUCTURE FOR CATHODE-RAY TUBES Stanley J. Koch, Clifton, and Robert E. Rutherford, Rutherford, N. J., assignors to Allen B. Du Mont Laboratories, ,Inc., Passaic, N. J., a

corporation of Delaware Application October 8, 1943,-Serial No. 505,494

This invention relates to gun structure for cathode-ray tubes, and the method of producing and assembling the same. By this invention such structures can be produced in a very rapid and teristics.

In carrying out this invention pieces of thin metal of rectangular shapes with lugs or extensions at opposite ends are provided for forming cylindrical portions of the gun structure, and discs are also provided from the same sort of thin metal for forming the remainder of the same. These pieces are then shaped and assembled, without welding or soldering, so as to form electrodes for the gun that are rigid and free from the danger of becoming distorted or out of shape during use. The electrodes are mounted upon stifi insulating rods which may be of ceramic material with holes therethrough so that leads for electrical potential may be placed therein when desired.

The invention may be understood from the description in connection with the accompanying drawings, in which- Fig. 1 is a side view of an illustrative embodiment of the invention;

Fig. 2 is a plan view of one of the electrodes;

pieces, after having been shaped with two of the discs, in place, shown in section; and

Fig. 4 is a side view of a mating rectangular piece without the discs.

In the drawings, reference characters I, 2, 3 and 4 indicate the control grid, pre-accelerator, first anode and second anode, respectively, of an electron gun. Each of these electrodeshas extensions on opposite sides thereof by means of which they are mounted upon supports 5 and 6 of insulating material that may, for example, be hollow rods of ceramic material. The formation of one of these electrodes will be described in detail in connection with Figs. 2 to 4 from which it will be obvious how the others are formed.

The electrodes I, 2, 3 and 4 (Fig. 1), each of I which may be made as described above, and of different lengths with a suitable number of discs 24 in each, are mounted upon the supports 5 and 6 by placing the semi-circular portions 2! around these supports and attaching the extensions [3 on both sides of the supports by spot welding, for example, as indicated at 33, 3 3, thus clamping the electrodes securely in place and charac- 6 Claims. (01. 250- 162) providing great rigidity of the assembled parts.

Reference character 1 indicates one of the rectangular pieces or metal after it has been formed into final shape, and reference character 8 indicates the other one. The body portion of piece 1 is slightly longer than that of theother one, for a purpose to be described. The pieces land 8 are semi-circular and are provided with diametrically opposite radially extending lugs 9, I0, I I and I2, respectively, at opposite ends thereof, such that the distance between the ends of these lugs is the same in each case as shown at [3 (Fig. 1). The piece 'I' is slit at [5 and I6 (Fig. 3) along opposite sides of the lugs 9, and Ill, and the portions l1 and I8 are bent back around the shorter portions I9 and 20 of piece 8, as described below.

The lugs 9, H), II and I2 are bent at 2| to form semi-circles so that when the parts are as- Fg. 3 is a side view of one of the rectangular sembled, as shown in Fig. 2, these lugs keep the parts in place. Circular clamps are thereby provided for holding the electrodes in place on the rod supports 5 and 6 (Fig. 1) that are to be located in the tube in which the gun is to be installed.

One or more flanged discs 24 (Fig. 3) are provided for each one of the electrodes I to 4. Each disc is provided with a central aperture 25 at the center for the electron beam to pass through and with a circular rib 26 concentric with this hole, this rib being for the purpose of making this disc more rigid. The flange 21 of the disc 24 is provided with an outwardly extending circular rib 28 which fits in a semi-circular groove such as those shown at 30 and 3| that are formed on the inside of the semi-circular portions of the pieces 1 and 8.

In order to assemble the parts of each electrode,

the disc 24 is placed with its rib 28 in the groove 30 of piece 1, the piece 8 is put in place. with its groove 3! fitting the other half of the rib 28 and the extensions l1 and I8 on piece I are then bent back over the ends of the extensions l9 and 29 on piece 8 as shown in Fig. 2, whereupon the parts of the electrode are securely assembled in a rigid condition. In cases where more than one aperture, such as the one shown at 25, is needed in an electrode, other discs are installed in a similar manner.

What is claimed is:

1. An electrode for an electron gun, comprising a disc and two semi-circular contacting parts, each of said contacting parts having a groove therein for receiving the edge of said disc and holding it in position and diametrically disposed 3 integral extensions on each of said semi-circular parts for holding said semi-circular parts toether.

2. The electrode of claim 1 in which said extensions are provided with mating semi-circular portions zforlenabling said electrode to be clamped to supports.

3. The electrode of claim 1 in which said extensions are provided with mating semi-circular portions for enabling said electrode to be clamped to supports, said mating circular portions being shorter axially than said semi-circular contacting parts.

4. An electron-electrode comprising a tubular member, an apertured disc member in said tubular member, a peripheral groove on one of said members, and a peripheral rib on the other of said. members fitting in said groove and thereby holding said two members in predetermined position axially of said tubular member and against relative movement axially of said tubular member..

5. An electron-electrode comprising a tubular member, and a plurality of apertured disc members positioned Within said tubular members in longitudinally spaced relation with their apertures invalignment, said tubular member and each oi said disc members having interfitting radially extending portions for holding said disc mem- REFERENCES ClTED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,060,825 Ressler Nov, 17, 1936 2,131,192 Schlesinger Sept. 27, 1938 2,153,223 7 Young Apr. 4, 1939 FOREIGN PATENTS Number Country Date 102,284 Australia Oct. 16, 1936 

